Hi, I've just replaced the fork oil and seals on my 99 ZX-6R. Once the bike was back together I noticed the forks were very stiff, I backed off the damping adjusters and the forks were back to normal. I then discovered that while the service manual says to use 10 weight oil, I had racetech valves put in a while ago and they put in 5 weight oil. My question is, is it bad to be running the racetech valves with 10 weight? I'm still able to get the damping I want but it's very close to the limit on the damping adjustment. Cheers, Duncan.